引用自定义组件的属性和方法

CountryComboBox类继承了ComboBox类，所以能够在初始化自定义组件的MXML标签中或者在<mx:Script>标签中的ActionScript中，引用所有属性和方法。下边的例子指定了rowCount属性，并且为自定义组件的close事件指定了监听器。

例子

components/CountryComboBox.as

package components

{

    import mx.controls.ComboBox;

  

    public class CountryComboBox extends ComboBox

    {

        public function CountryComboBox ()

        {

            dataProvider = [ "United States", "United Kingdom" ];

        }

    }

}

应用程序MXML文件

<?xml version="1.0" encoding="utf-8"?>

<mx:Application

    xmlns:mx="http://www.adobe.com/2006/mxml"

    xmlns:custom="components.*"

    width="270" height="170"

>

    <mx:Script>

        <![CDATA[

            import flash.events.Event;

            private function handleCloseEvent(eventObj:Event):void

            {

                status.text = "You selected: \r" + countries.selectedItem as String;

            }  

        ]]>

    </mx:Script>

    <mx:Panel

        title="Custom component inheritance"

        paddingTop="10" paddingBottom="10" paddingLeft="10" paddingRight="10"

    >

        <custom:CountryComboBox

            id="countries" rowCount="5"

            close="handleCloseEvent(event);"

        />

        <mx:Text id="status" text="Please select a country from the list above." width="136"/>      

    </mx:Panel>

</mx:Application>